The density of a planet can be determined by combining Doppler and astrometric measurements
Indicate whether the statement is true or false
FALSE
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A(n) ________ galaxy is the result of the collision and merger of galaxies that leave little cold gas remaining in the system.
A. spiral B. barred spiral C. elliptical D. irregular
The Sun's location in the Milky Way Galaxy is ________
A) in the galactic disk, roughly halfway between the center and the outer edge of the disk B) in the halo of the galaxy, about 28,000 light-years above the galactic disk C) very near the galactic center D) at the very outer edge of the galactic disk
Once an object strikes Earth's surface, it is called a "meteor"
a. True b. False Indicate whether the statement is true or false
In a modern light water reactor, the ratio of U235 to U238 in the nuclear fuel is typically in the approximate ratio of
A. 11%. B. 3%. C. 100%. D. 0.7%. E. 67%.